The documentary "Defending Food" discusses the influence of modern diet on human health by introducing the changes of modern eating habits, including the increase of diseases such as obesity, diabetes and heart disease. By introducing the concept and methods of healthy eating, the documentary encourages people to change their eating habits, such as choosing more healthy foods such as vegetables, fruits and whole grains, and reducing the intake of unhealthy ingredients such as sugar, salt and saturated fat. The documentary also introduces some global healthy eating initiatives, such as "Mediterranean Diet" and "Japanese Diet", aiming at encouraging people to stay healthy by changing their eating habits. The documentary "Defending Food" aims to improve people's understanding of food health and advocate people's healthy lifestyle by introducing the problems existing in modern diet and their solutions.